This article describes a feature in the first Apocalypse Rising
The Hero Badge is the hardest to earn out of the three first-stage badges (Bandit, Survivor and Hero). You will need to kill three bandits, and survive for 3 days. Once you get an aggressive kill (a kill on a non-bandit), your Hero run will be over. Obtaining the Hero Badge will give you a blue headband.
A common method was to join a bandit group and then betray them.
"Awarded to those who kill at least 3 bandits without any aggressive kills, and survive for 3 days."